Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 272)

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Turning the LCD Monitor Off/On
You can set the camera so that the LCD monitor does not turn off and on as
you press the shutter button halfway (or press the <
A
> button).
Under the [ 5 ] tab, select [Screen off/on
btn] , then press < 0 >. The available
settings are described below. Select the
option, then press < 0 >.
z [Shutter btn.] : When you press the shutter button halfway, the
display will turn off. When you let go of the shutter
button, the display will turn on.
z [Shutter/DISP] : When you press the shutter button halfway, the
display will turn off. The display will remain off even
after you let go of the shutter button. To turn on the
display, press the < U > button.
z [Remains on] : Display remains on even when you press the shutter
button halfway. To turn off the display, press the
< U > button.